Climate averages 1991–2020
Niigata weather
in August.
A hot, wet month: the warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Niigata: daytime highs average 28.3°C and nights cool to about 22.7°C. By daytime temperature it is the warmest month of the year.
Expect about 159 mm of rain on roughly 13 days, which makes August a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 38 min on an average August day.
The nearest other city in this atlas is Shibata (26 km away). In August its highs average 28.6°C, about as warm as Niigata, with 194 mm of rain.
Among the 303 cities listed in Japan, Niigata ranks joint 230th of 303 for the warmest August highs and joint 184th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Niigata is 0.9°C cooler than that mean.
From August to September, average highs fall by 3.6°C to 24.7°C, and monthly rainfall falls from 159 mm to 146 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Niigata climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.2°C0.0°C | 0.0°C | 178 | 26.6 | 9.910 h |
| February | 4.7°C-0.6°C | -0.6°C | 115 | 21.3 | 10.811 h |
| March | 8.6°C1.8°C | 1.8°C | 110 | 18.6 | 11.912 h |
| April | 14.1°C6.0°C | 6.0°C | 90 | 12.6 | 13.213 h |
| May | 19.4°C11.4°C | 11.4°C | 99 | 11.8 | 14.214 h |
| June | 23.1°C16.5°C | 16.5°C | 123 | 11.2 | 14.715 h |
| July | 26.6°C21.2°C | 21.2°C | 226 | 15.2 | 14.515 h |
| August, selected | 28.3°C22.7°C | 22.7°C | 159 | 12.9 | 13.614 h |
| September | 24.7°C19.2°C | 19.2°C | 146 | 14.2 | 12.512 h |
| October | 19.1°C13.1°C | 13.1°C | 155 | 15.8 | 11.211 h |
| November | 13.2°C7.5°C | 7.5°C | 164 | 19.7 | 10.210 h |
| December | 7.5°C2.7°C | 2.7°C | 195 | 25.4 | 9.610 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Shibata in AugustJapan · 26 kmHigh 28.6°C · Low 21.7°C · 194 mm rain
- Tsubame in AugustJapan · 30 kmHigh 28.8°C · Low 22.3°C · 149 mm rain
- Sanjō in AugustJapan · 35 kmHigh 29.4°C · Low 21.8°C · 169 mm rain
- Nagaoka in AugustJapan · 55 kmHigh 29.8°C · Low 21.6°C · 146 mm rain
- Kashiwazaki in AugustJapan · 75 kmHigh 29.6°C · Low 22.0°C · 145 mm rain
- Aizu-Wakamatsu in AugustJapan · 93 kmHigh 27.8°C · Low 20.6°C · 132 mm rain
- Yonezawa in AugustJapan · 94 kmHigh 27.7°C · Low 20.6°C · 183 mm rain
- Jōetsu in AugustJapan · 112 kmHigh 29.3°C · Low 22.2°C · 122 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Niigata) is explained once on the Niigata year overview and on the Sources, method and limits page.